Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1990-06-22
1991-03-19
Perkey, W. B.
Optics: measuring and testing
Range or remote distance finding
With photodetection
356 1, 356 4, G03B 1336, G01C 308
Patent
active
050015087
ABSTRACT:
A range finder for an automatic camera in which the average total power required for driving the ranging light source is significantly reduced. In accordance with a first aspect of the invention, the intensity of the light emitted by the ranging light source is controlled in accordance with the detected intensity of the reflected light in such a manner that the intensity of light emitted by the light source is reduced to the minimum necessary for carrying out distance calculations. In accordance with a second aspect of the invention, the number of pulses of light emitted from the ranging light source is controlled in accordance with the detected reflected light intensity so that a minimum number of light pulses is emitted consistent with the minimum necessary for carrying out distance calculations.
REFERENCES:
patent: 4589773 (1986-05-01), Ido et al.
Asahi Kogaku Kogyo K.K.
Perkey W. B.
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